1.  What substitution can be made in the ideal gas law?  Rearrange the ideal gas law to solve for molar mass  Rearrange the ideal gas law to solve for density  Calculate the density a gas will have at 5 o C and 1.25 atm if its molar mass is 39.9 g/mol.

2. Pg. 101

3.  Says regardless of size of particles, the volume will be the same at the same temperature and pressure  1000 particles of krypton has same volume as 1000 particles of hydrogen at same P and T  Molar volume- volume that one mole of substance occupies at 0.00 o C and 1 atm (standard temperature and pressure)  At STP, 1 mole of gas occupies 22.4 L

4.  Ex. Calculate the volume that 0.881 mol of gas at STP will occupy  How many grams of carbon dioxide gas are in a 1.0 L balloon at STP?  Determine the volume of a container that holds 2.4 mol of gas at STP.

5.  Masses given must be converted to moles first  Ex. Ammonium nitrate is a common ingredient in chemical fertilizers. Use the reaction shown to calculate the mass of solid ammonium nitrate that must be used to obtain 0.100 L of dinitrogen oxide gas at STP. ◦ NH 4 NO 3  N 2 O +2H 2 O